Pressure-controller.



No. 866,643. PATENTED SEPT. 24, 1907. J. H. GLENN & M. RB-ULE.

PRESSURE CONTROLLER.

APPLIUATION FILED APR.10,1907.

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To. all whom it may conwn:

1 facts 7 and 8 are connected, and the circuit will be UNITED STATES' PATENT OFFICE.

JAMES H. GLENN AND MICHAEL REULE, OF LA FAYETTE, INDIANA.

PRESSURE CONTROLLER.

Specification of Letters Patent.

Patented Sept. 24, 1907.

Application filed April 10, 1907. Serial No. 367,465.

Be it known that-we, James H. GLENN and LIICHAEL REULE, citizens of the United States, residing at La Fayette, in the county of Tippecanoe and State of 'In- (liana, have invented certain new and useful Improvements in Pressure-Controllers, of which the following is a specification.

This invention is a pressure controller for electrically driven air pumps,-and more particularly an apparatus for automatically breaking the circuit to throw the motor out of operation when a predetermined receiver pressure has been attained, and to close the circuit to start the motor when the receiver pressure has fallen, to a predetermined limit.

The object of the invention is to provide a controller embodying simplicity of construction, and one which is verysensitive to varying pressures and reliable in opcratiom'and also to prevent the formation.

contacts 7 and 8, respectively. The contact 7 is connected by a wire 9 to one of the mains 10. The other main is connected by a wire 11 to one of the brushes oi the motor 12. The other brush of the motor connected by a wire 13 to the contact 8. By this arrangement the motor circuit will be closed when the conopened when said contacts are disconnected.

At 14 is indicated a cylinder which is in communication with the receiver or storage reservoir 15 by a pipe 16. The compressor 17 is driven by the motor 12.

In the cylinder is a plunger 18 having a stem 19 'which passes through a stufiing-box 20. O n'the outstem 19 by screwing it thereon or in any other suitable manner. 'The block is connected to another block 24 by a rigid frame 25. The block 24 has an opening through which a stem 26 loosely passes. The end of the stem 26, above the block 24 has a head 27 0f insulatingmaterial on the top of which is secured a contact plate 28 adapted to close. the motor circuit by en- To the end of the stem 26, below the block 24, is fastened a collar 30 having at its edge upstanding lugs 31. Between this collar and a collar 32 which is loose on the rod 26, a spring 33 is coiled around the stem. Above the block 24 the stem carries a loose collar 34, and above this a fixed collar 35 having depending lugs 36. A spring 37 is coiled around the stem between the collars 34 and 35. Above the last mentioned collar the stem carries a fixed collar 38.

Adjacent the stem 26 on opposite sides thereof are latches 39 and 40, respectively. The latch 39 comprises a lever 41 pivoted at 42 to the base 5 and held against a stop 43 by a spring 44. The free end of the lever is turned down as indicated at 45, and to said end is pivoted at 46 a finger 47, one end of which is bent upwardly as indicated at 48'to engage the lever 41. The finger is held in this position by a spring 49. The latch 40 comprises a spring-actuated lever 50 and finger 51, these parts being arranged in the same manner as the parts comprising the latch 39 except that their position is reversed so that they work oppositely.

The operation of the apparatus is as iollows:-In Fig. 1 is shown the position of the parts when the motor circuit is closed. As the cylinder 14 is in communication with the receiver 15 the pressure in the latter will be exerted on the plunger 18. As soon as the pressure exceeds the tension of the spring 21, the plunger will commence to move downwardly in the cylinder, which movement is communicated to the block 24 by reason of the connection between said block and the plungerstem 19. The downward movement of the block 24 by reason of its engagement with the collar 32 32 causes it to compress the spring 33 until the collar engages the lugs 31. As the collar 30 is fast on the stem26 the latter will now commence to move downwardly withthe plunger-stem thus gradually withdrawing the contact 28- from the contacts 7 and 8. The final separation of the contacts is made with a quick jerk so that no arcing can take place. This is accomplished in the following manner: The tension of the springs of the lovers 41 and 50-is greater than the springs 37 and 33 but less than the spring 21. When tne stem 26 moves downwardly in the manner and opening the circuit. The collar 38 can pass the finger 51 as it moves downwardly and after the collar passes said finger the latter is returned to its normal position by its spring. The parts now are in the position shown in Fig. 2. When the-receiver-presure drops to the predetermined minimum, the spring 21 2-5 -the aforesaid block, tensioned latches opposing the movebrake system of electric railway mrs the wire 9 will be I actuated to oppose the receiver pressure, and a plungermoves the stem 19 upwardly and a reversal of the operation 'just' described takes place, the collars 34 and 35 being brought intoaction to compress the spring 37, and the collar 38 engaging the latch 40 so that at soon as it passes the same the stem is shot upwardly to bring the contact 28'between the contacts 7 and 8 and thus close the circuit. p

The apparatus herein described effectively serves the purpose for which it is intended. It is sensitive and reliable in operation and by reason of its simplicity of construction it is not liable to get out of order.

If the apparatusis'used in connection with the airconnectedto the car circuit and the wire 11 to the ground or return circuit.

We claim: 1. The combination with the receiver of an electricallydriven compressor, :1 cylinder in communication with the receiver, a plunger working in the. cylinder and spring-' stem 01' a block carried by the plunger-stem and having an opening, a stem working in said opening and carrying circuit-closing means, a yielding connection between the plunger-stem and the circuit-closing stem at both ends of merit of the circuit-closing stem, the tension of said latches being greater than the yielding connection between the plungerestem and the circuit-closing stem, and latch engaging means carried by the circuit-closing stem.

2. A pressure controller for electrically driven compressors comprising a receiver, a cylinder in communication' with the receiyer, a plunger working in the cylinder was:

means, a fixed collar on the circuit-closing stem below the block, a spring between the collar and the block, a

tilted collar on the circuit-closing stem above the block, a spring between the last mentioned collar and the block,

tensio ned latches opposing the movement ot the circuitclosing stem, the tension of said latches being greater than the springs on the circuit-closing.stem, and latch engag ing means carried by said stem. I

3. A pressure controller for electrically driven compressors comprising a receiver, a cylinder in communication with the receiver, a plungdi' working in the cylinder and spring-actuated to oppose the receiver pressure, means for regulating the, tension or the plunger-spring, a plungerstem, a block carried by the plunger-stem and having an opening, a stem working in the opening of the aforesaid block and having 'at one end circuit-closing means, a fixed collar on the circuit-closlng'stem below the block, a spring between the collar and the block, a fixed collar on the circuit-closing stem above the blocir, a spring between the last mentioned collar and the block, tensioned latches opposing the movement '0! the circuit-closing stem, the tension of said latches being greater than the springs on the circuit-closing stem, and latch engaging means carried by said stem.

In testimony whereof we aflix our signature, in presence of two witnesses.

JAMES [L GLENN. MICHAEL 'REULE.

Witnesses Wrnnurl J. Bnscmzx, Jums GLENN. 

